JP2001022325A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
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- JP2001022325A JP2001022325A JP11194443A JP19444399A JP2001022325A JP 2001022325 A JP2001022325 A JP 2001022325A JP 11194443 A JP11194443 A JP 11194443A JP 19444399 A JP19444399 A JP 19444399A JP 2001022325 A JP2001022325 A JP 2001022325A
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- voltage
- gradation
- positive
- circuit
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- Liquid Crystal Display Device Control (AREA)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はアクティブマトリク
ス型の液晶表示装置に関し、とくに階調表示特性の調整
を容易にした液晶表示装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active matrix type liquid crystal display device, and more particularly to a liquid crystal display device which facilitates adjustment of gradation display characteristics.
【０００２】[0002]
【従来の技術】従来の液晶表示装置における階調信号と
表示輝度の関係を表す階調−輝度特性の決定方法を述べ
る。図８に従来の階調電圧生成方法を示す。１１は階調
電圧発生回路であり、１２はドライバＩＣである。ま
ず、階調電圧生成回路１１では抵抗分割により参照電圧
レベルＶ0〜Ｖ2X-1を設定する。ドライバＩＣ１２内で
は、さらに抵抗分割などの方法により隣接する参照電圧
レベルを分割することで、多階調の階調電圧を生成す
る。このように、階調−輝度特性は、階調電圧生成回路
で生成される参照電圧レベルによって決定される。した
がって、参照電圧レベルを決定する抵抗値を変化させる
ことにより、階調−輝度特性を可変させることができ
る。2. Description of the Related Art A method of determining a gradation-luminance characteristic representing a relationship between a gradation signal and display luminance in a conventional liquid crystal display device will be described. FIG. 8 shows a conventional gradation voltage generation method. Reference numeral 11 denotes a gradation voltage generation circuit, and reference numeral 12 denotes a driver IC. First, to set a reference voltage level V 0 ~V 2X-1 by the gradation voltage resistive divider Generating circuit 11. In the driver IC 12, the adjacent reference voltage levels are further divided by a method such as resistance division to generate a multi-gradation gradation voltage. As described above, the gradation-luminance characteristics are determined by the reference voltage level generated by the gradation voltage generation circuit. Therefore, the gradation-luminance characteristics can be varied by changing the resistance value that determines the reference voltage level.
【０００３】図９に特開平２−３４８２３５号における
従来の階調−輝度特性の可変方法を示す。１３は階調電
圧可変回路である。この方法では、可変抵抗としてＶＲ
１、ＶＲ２、ＶＲ３、ＶＲ４、ＶＲ５を設けている。こ
れら５個の可変抵抗をそれぞれ調整することにより、所
望の階調−輝度特性に変化させる。FIG. 9 shows a conventional method of varying the gradation-luminance characteristics in Japanese Patent Application Laid-Open No. 2-348235. 13 is a gradation voltage variable circuit. In this method, VR is used as a variable resistor.
1, VR2, VR3, VR4, and VR5. By adjusting each of these five variable resistors, a desired gradation-luminance characteristic is changed.
【０００４】[0004]
【発明が解決しようとする課題】図８に示した、固定抵
抗により直列分圧することで参照電圧レベルを生成する
階調電圧生成方法では、階調−輝度特性を調整・変化さ
せるためには、固定抵抗を作りかえる必要がある。その
ため、ユーザが階調−輝度特性を調整・変化させるのは
困難である。In the gray scale voltage generation method shown in FIG. 8 which generates a reference voltage level by dividing the voltage in series with a fixed resistor, in order to adjust and change the gray scale-luminance characteristic, It is necessary to change the fixed resistance. Therefore, it is difficult for the user to adjust and change the gradation-luminance characteristics.
【０００５】図９に示した階調−輝度特性の可変方法で
は、ＶＲ２〜ＶＲ５は直列に接続されており、ある一つ
のＶＲを変化させると多のＶＲとの比率関係がすべて変
わるため、参照電圧レベルを所望の値にする調整が煩雑
となり、ユーザが階調−輝度特性を調整・変化させるの
は困難である。また、正極性電圧と負極性電圧間のＶＲ
１により、白レベル（ノーマリーホワイトモードの場
合）に対応するＶ７ＨとＶ７Ｌが変化してしまう。この
ため、表示装置の重要な特性である白色輝度の低下、お
よび白と黒の比であるコントラスト比の低下という性能
の悪化を招く。In the method of changing the gradation-luminance characteristic shown in FIG. 9, VR2 to VR5 are connected in series, and when one VR is changed, all the ratio relations with many VRs are changed. Adjustment for setting the voltage level to a desired value becomes complicated, and it is difficult for the user to adjust and change the gradation-luminance characteristics. In addition, VR between the positive voltage and the negative voltage
Due to 1, V7H and V7L corresponding to the white level (in the case of the normally white mode) change. For this reason, the performance of the display device is deteriorated such as a decrease in white luminance, which is an important characteristic of the display device, and a decrease in contrast ratio, which is a ratio of white to black.
【０００６】[0006]
【課題を解決するための手段】本発明の液晶表示装置
は、多段階表示に必要な複数の参照電圧を生成する階調
電圧生成回路を備えた液晶表示装置であって、正負の基
準電圧から正負対称な複数の参照電圧を生成する電圧分
割回路と、前記電圧分割回路の特定の中間調に対応する
正負対称な１対の電圧分割点のそれぞれに、階調調整用
の正負対称な参照電圧を供給する可変電圧生成回路と１
対の差動増幅器を備えている。A liquid crystal display device according to the present invention is a liquid crystal display device provided with a gradation voltage generating circuit for generating a plurality of reference voltages required for multi-stage display, wherein the liquid crystal display device is provided with a positive / negative reference voltage. A voltage dividing circuit for generating a plurality of positive-negative symmetric reference voltages; and a positive-negative symmetric reference voltage for gradation adjustment applied to each of a pair of positive-negative symmetric voltage dividing points corresponding to a specific halftone of the voltage dividing circuit. And a variable voltage generator that supplies
It has a pair of differential amplifiers.
【０００７】また、本発明の液晶表示装置は、多階調表
示に必要な複数の参照電圧を生成する階調電圧生成回路
を備えた液晶表示装置であって、正負の基準電圧から正
負対称な複数の参照電圧を生成する電圧分割回路と、前
記電圧分割回路の特定の複数の中間調に対応する正負対
称な前記複数対の電圧分割点のそれぞれに、階調調整用
の正負対称な参照電圧を供給する前記複数個の可変電圧
生成回路と前記複数対の差動増幅器とを備えている。Further, the liquid crystal display device of the present invention is a liquid crystal display device provided with a gradation voltage generating circuit for generating a plurality of reference voltages required for multi-gradation display, wherein the liquid crystal display device is symmetric with respect to positive and negative reference voltages. A voltage dividing circuit for generating a plurality of reference voltages; and a positive / negative symmetric reference voltage for gradation adjustment at each of the plurality of pairs of positive / negative symmetric voltage dividing points corresponding to a specific plurality of halftones of the voltage dividing circuit. And a plurality of pairs of differential amplifiers.
【０００８】また、本発明の液晶表示装置は、多階調表
示に必要な複数の参照電圧を生成する階調電圧生成回路
を備えた液晶表示装置であって、正負の基準電圧から正
負対称な複数の参照電圧を生成する電圧分割回路と、前
記電圧分割回路の特定の複数の中間調に対応する正負対
称な前記複数対の電圧分割点に、階調、調整用の正負対
称な前記複数対の参照電圧を供給する１個の可変電圧生
成回路および前記複数対の増幅器とを備えている。Further, the liquid crystal display device of the present invention is a liquid crystal display device provided with a gradation voltage generating circuit for generating a plurality of reference voltages required for multi-gradation display, wherein the liquid crystal display device is symmetric with respect to the positive and negative reference voltages. A voltage dividing circuit for generating a plurality of reference voltages; and the plurality of symmetrical positive and negative symmetrical pairs for gradation and adjustment at the plurality of positively and negatively symmetrical voltage dividing points corresponding to a plurality of specific halftones of the voltage dividing circuit. And a plurality of pairs of amplifiers.
【０００９】また、本発明の液晶表示装置は、多階調表
示に必要な複数の参照電圧を生成する階調電圧生成回路
を備えた液晶表示装置であって、正負の基準電圧から複
数の参照電圧を生成する電圧分割回路と、前記電圧分割
回路の特定の複数の中間調に対応する正負対称な前記複
数対の電圧分割点に、階調調整用の参照電圧を供給する
前記電圧分割点の数と同数の可変電圧生成回路および増
幅器の組とを備えている。Further, the liquid crystal display device of the present invention is a liquid crystal display device provided with a gradation voltage generating circuit for generating a plurality of reference voltages necessary for multi-gradation display. A voltage dividing circuit that generates a voltage; and a voltage dividing point that supplies a reference voltage for gradation adjustment to the plurality of pairs of positive and negative symmetric voltage dividing points corresponding to a plurality of specific halftones of the voltage dividing circuit. The same number of variable voltage generating circuits and amplifier sets are provided.
【００１０】[0010]
【発明の実施の形態】実施の形態１ 図１は、本発明の第１の実施の形態にかかわる階調特性
の可変な階調電圧生成回路の構成を示す回路図である。
１は基準電圧生成回路、２は階調特性可変回路、３は可
変電圧生成回路、４、５は増幅器であり、ここでは差動
増幅器を用いている。基準電圧生成回路１は、正負の基
準電圧ＶＨ、ＶＬから抵抗分割により参照電圧Ｖph、Ｖ
pl、Ｖnh、Ｖnlを生成する。階調特性可変回路２は参照
電圧Ｖph、Ｖpl、Ｖnh、Ｖnlを抵抗分割し、第２の参照
電圧Ｖ1〜Ｖx-1、Ｖx〜Ｖ2x-2を生成する。可変電圧生
成回路３は第２の参照電圧Ｖ1〜Ｖx-1のうち特定の抵抗
分割点の電圧を調整するための参照電圧を発生し、この
調整用参照電圧は差動増幅器４、５により正負対称の電
圧に変換されて前記特定の抵抗分割点に与えられる。本
実施の形態では前記特定の抵抗分割点としてノーマリー
ホワイトモードにおける黒レベル側のＶ1およびそれと
正負対称なＶ2x-2を選択しているが、Ｖ2、Ｖ 2x-3など
他の正負対称な抵抗分割点とすることもできる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 shows a gradation characteristic according to a first embodiment of the present invention.
FIG. 3 is a circuit diagram showing a configuration of a variable gradation voltage generation circuit.
1 is a reference voltage generation circuit, 2 is a gradation characteristic variable circuit, and 3 is
The variable voltage generating circuits, 4, and 5 are amplifiers, and here, differential
An amplifier is used. The reference voltage generation circuit 1
The reference voltages Vph, Vph are divided from the reference voltages VH, VL by resistance division.
Generate pl, Vnh, and Vnl. Refer to gradation characteristic variable circuit 2.
The voltages Vph, Vpl, Vnh, and Vnl are divided by resistors, and the second reference
Voltage V1~ Vx-1, Vx~ V2x-2Generate Variable voltage generator
The formation circuit 3 has a second reference voltage V1~ Vx-1Specific resistance out of
Generate a reference voltage to adjust the voltage at the split point, and
The reference voltage for adjustment is positive and negative symmetrical by differential amplifiers 4 and 5.
It is converted to a pressure and given to the specific resistance division point. Book
In the embodiment, the specific resistance dividing point is normally
V on black level side in white mode1And with it
Positive and negative symmetric V2x-2Is selected, but VTwo, V 2x-3Such
Other positive-negative symmetric resistance division points may be used.
【００１１】まず、基準電圧生成回路１で参照電圧Ｖph
＝Ｖ0，Ｖpl＝Ｖx-1，Ｖx，Ｖnl＝Ｖ2x-1（ｐは対向電
極電圧Ｖcomに対して正極性、ｎは負極性）を設定す
る。つぎに、階調特性可変回路２においてＶ1〜Ｖx-1、
およびＶx〜Ｖ2x-2を固定抵抗で直列分圧させる。可変
電圧生成回路にて、黒レベル側（ノーマリーホワイトの
場合）に対応する参照電圧のうち、正極性のＶ1をＶ0か
ら所望の値だけ減少させ、負極性のＶ2x-2をＶ2x-1から
所望の値だけ増加させる。本実施の形態では、これら２
レベルを同時に変化させることで、参照電圧レベルのＶ
1〜Ｖx-1、Ｖx〜Ｖ2x-2の電圧を滑らかに変化させるこ
とが可能である。First, the reference voltage generation circuit 1 generates the reference voltage Vph
= V 0 , Vpl = V x−1 , V x , Vnl = V 2x−1 (p is positive with respect to the counter electrode voltage Vcom, n is negative). Next, in the gradation characteristic variable circuit 2, V 1 to V x−1 ,
And V x ~V the 2x-2 causes pressure series minute fixed resistance. By the variable voltage generator, of the reference voltage corresponding to the black level side (case of a normally white), the V 1 of the positive polarity is reduced from V 0 by a desired value, the V 2x-2 negative polarity V Increase from 2x-1 by the desired value. In the present embodiment, these two
By simultaneously changing the level, the reference voltage level V
It is possible to smoothly change the 1 ~V x-1, V x ~V 2x-2 voltage.
【００１２】本実施の形態では、可変電圧生成回路３の
可変抵抗として、電子ポテンションメーターを用いた。
この場合、シリアルのデジタル信号（制御信号）によっ
てＶ 1、Ｖ2x-2の電圧を設定できるため、ユーザが階調
−輝度特性を調整することも可能である。In this embodiment, the variable voltage generation circuit 3
An electronic potentiometer was used as a variable resistor.
In this case, a serial digital signal (control signal)
V 1, V2x-2Voltage can be set, allowing the user
-It is also possible to adjust the luminance characteristics.
【００１３】また、可変電圧生成回路に可変抵抗を用い
ることでも、電子ポテンションメーターを用いた場合と
同様に、Ｖ1、Ｖ2-2xの電圧を設定できるため、ユーザ
が階調−輝度特性を調整することが可能である。Also, by using a variable resistor for the variable voltage generating circuit, the voltage of V 1 and V 2-2x can be set similarly to the case of using an electronic potentiometer , so that the user can obtain the gradation-luminance characteristic. Can be adjusted.
【００１４】図２に本実施の形態により得られた階調−
輝度特性を示す。まず、図１中の固定抵抗で階調−輝度
特性を表わすγ値を２．８に設定した。このときの輝度
特性を図中の破線で示す。つぎに、可変電圧生成回路３
の可変抵抗にてγ＝１．８を目標にＶ1、Ｖ2x-2を変化
させた場合の輝度特性を図中の実線で示す。この輝度特
性は、従来の図８の回路でγ＝１．８となるように固定
抵抗を設定した場合の特性（図中の一点鎖線で示す特
性）とほぼ一致している。このように本実施の形態では
一つの可変電圧生成回路３にて階調−輝度特性の調整、
変化を容易に行うことができる。FIG. 2 shows the gradation obtained by the present embodiment.
4 shows luminance characteristics. First, the γ value representing the gradation-luminance characteristic with the fixed resistor in FIG. 1 was set to 2.8. The luminance characteristics at this time are indicated by broken lines in the figure. Next, the variable voltage generation circuit 3
The solid line in the figure shows the luminance characteristics when V 1 and V 2x−2 are changed with γ = 1.8 as the target by the variable resistor. This luminance characteristic substantially coincides with the characteristic (characteristic indicated by a chain line in the figure) when the fixed resistance is set so that γ = 1.8 in the conventional circuit of FIG. As described above, in the present embodiment, the adjustment of the gradation-luminance characteristics by one variable voltage generation circuit 3 is performed.
Changes can be made easily.
【００１５】実施の形態２ 図３に本発明の第２の実施の形態における階調電圧生成
回路の構成を示す。可変電圧生成回路にて、白レベル側
（ノーマリーホワイトの場合）に対応する参照電圧のう
ち、正極性のＶx-2をＶx-1から所望の値だけ増加させ、
負極性のＶx+1をＶxから所望の値だけ減少させる。本実
施の形態では、これら２レべルを同時に変化させること
で、参照電圧レベルのＶ0〜Ｖx-2、Ｖx+1〜Ｖ2x-1の電
圧値を滑らかに変化させることが可能であり、実施の形
態１と同様に、一つの可変電圧生成回路にて階調−輝度
特性の調整、変化を容易に行うことができる。図４に本
実施例にて階調−輝度特性を変化させた様子を示す。図
中の破線は、図１中の固定抵抗により、階調−輝度特性
をγ＝１．８に設定したときの特性を示し、実線は、可
変電圧生成回路３によりγ＝２．８の特性を目標として
設定したときの特性を示している。Embodiment 2 FIG. 3 shows a configuration of a gradation voltage generation circuit according to a second embodiment of the present invention. In the variable voltage generating circuit, of the reference voltage corresponding to the white level side (in the case of normally white), V x−2 of the positive polarity is increased by a desired value from V x−1 ,
The negative polarity V x + 1 is reduced from V x by a desired value. In the present embodiment, by simultaneously changing these two levels, it is possible to smoothly change the voltage values of the reference voltage levels V 0 to V x-2 and V x + 1 to V 2x-1. Thus, similarly to the first embodiment, the adjustment and change of the gradation-luminance characteristics can be easily performed by one variable voltage generation circuit. FIG. 4 shows how the gradation-luminance characteristics are changed in this embodiment. The dashed line in the figure shows the characteristic when the gradation-luminance characteristic is set to γ = 1.8 by the fixed resistor in FIG. 1, and the solid line shows the characteristic when γ = 2.8 by the variable voltage generation circuit 3. Shows the characteristics when is set as a target.
【００１６】実施の形態３ 図５では一つの可変電圧生成回路３で、黒側に近い中間
階調対応の参照電圧Ｖ 1、Ｖ2x-2、および白側に近い中
間階調対応の参照電圧Ｖx-2−Ｖx-1を同時に変化させ
る。本実施の形態ではＶ0−Ｖ1間（Ｖ2x-1−Ｖ2x-2間）
の電圧差を増加させるとＶx-1−Ｖx-1間（Ｖx−Ｖ
x+1間）の電圧差を減少させることになる。本実施の形
態によれば、実施の形態１、２に較べて広範囲なγの可
変に対応できる。Third Embodiment In FIG. 5, one variable voltage generating circuit 3 is used to control an intermediate voltage near the black side.
Reference voltage V corresponding to gradation 1, V2x-2, And medium near the white side
Reference voltage V for gray scalex-2-Vx-1Change at the same time
You. In the present embodiment, V0-V1Between (V2x-1-V2x-2while)
When the voltage difference ofx-1-Vx-1Between (Vx-V
x + 1) Is reduced. Form of this implementation
According to the embodiment, a wider range of γ than in Embodiments 1 and 2 is possible.
Can respond to strange.
【００１７】実施の形態４ 図６に二つの可変電圧生成回路３ａ、３ｂを用いた階調
電圧生成回路を示す。可変電圧生成回路３ａは黒側の参
照電圧Ｖ1、Ｖ2x-2の値を同時に変化させ、可変電圧生
成回路３ｂは白側の参照電圧Ｖx-2、Ｖx+1の値を同時に
変化させる。本実施例によれば、たとえば、可変電圧生
成回路３ａにより黒側の参照電圧を大きく変化させた影
響で白側の参照電圧が所望の値からずれた場合に、その
ずれを補償するように可変電圧生成回路３ｂで調整する
ことができる。さらに、黒側だけの階調−輝度特性また
は白側だけの階調−輝度特性の調整、変化が可能である
ため、より精度よく、より自由に階調−輝度特性の調整
ができる。Embodiment 4 FIG. 6 shows a gradation voltage generation circuit using two variable voltage generation circuits 3a and 3b. The variable voltage generating circuit 3a simultaneously changes the values of the reference voltages V 1 and V 2x-2 on the black side, and the variable voltage generating circuit 3b simultaneously changes the values of the reference voltages V x-2 and V x + 1 on the white side. Let it. According to the present embodiment, for example, when the reference voltage on the white side deviates from a desired value due to the effect of greatly changing the reference voltage on the black side by the variable voltage generation circuit 3a, the variable voltage generation circuit 3a is configured to compensate for the deviation. It can be adjusted by the voltage generation circuit 3b. Further, since the gradation-luminance characteristic of only the black side or the gradation-luminance characteristic of only the white side can be adjusted and changed, the gradation-luminance characteristic can be adjusted more precisely and more freely.
【００１８】実施の形態５ 図７に参照電圧Ｖ1、Ｖx-2、Ｖx+1、Ｖ2x-2の各々に別
々の可変電圧生成回路３ａ〜３ｄを設けた場合の階調電
圧生成回路を示す。本実施の形態では実施の形態４に加
えて、正極性参照電圧、負極性参照電圧を独立に調整で
きるため、様々な特性の液晶および、様々なドライバＩ
Ｃに対応できる。たとえば、ＩＣドライバ内での階調電
圧の分割比が正負対称でない場合や、ドライバＩＣの出
力段バッファの駆動能力（Ｖ−Ｉ特性）が正負対称でな
い場合などにも必要に応じて階調電圧の調整が可能であ
る。The gray-scale voltage obtained when a separate variable voltage generating circuit 3a~3d to each of the reference voltages V 1, V x-2, V x + 1, V 2x-2 to Embodiment 5 FIG. 7 embodiment generates 1 shows a circuit. In the present embodiment, in addition to the fourth embodiment, since the positive reference voltage and the negative reference voltage can be independently adjusted, liquid crystals having various characteristics and various drivers I
C can be handled. For example, if the division ratio of the gradation voltage in the IC driver is not symmetrical, or if the driving capability (VI characteristic) of the output stage buffer of the driver IC is not symmetrical, the gradation voltage may be changed as necessary. Can be adjusted.
【００１９】[0019]
【発明の効果】本発明の液晶表示装置は、多段階表示に
必要な複数の参照電圧を生成する階調電圧生成回路を備
えた液晶表示装置であって、正負の基準電圧から正負対
称な複数の参照電圧を生成する電圧分割回路と、前記電
圧分割回路の特定の中間調に対応する正負対称な１対の
電圧分割点に、階調調整用の正負対称な参照電圧を供給
する可変電圧生成回路および増幅器とを備えたので、製
品の完成後においても簡単な操作により階調特性の調整
が可能である。The liquid crystal display device according to the present invention is a liquid crystal display device provided with a gradation voltage generating circuit for generating a plurality of reference voltages necessary for multi-stage display, wherein a plurality of reference voltages are symmetric with respect to the positive and negative reference voltages. And a variable voltage generator for supplying a positive / negative symmetric reference voltage for gradation adjustment to a pair of positive / negative symmetric voltage division points corresponding to a specific halftone of the voltage division circuit. Since the circuit and the amplifier are provided, the gradation characteristics can be adjusted by a simple operation even after the product is completed.
【図１】本発明の実施の形態１にかかわる階調電圧生成
回路の構成を示す回路図である。FIG. 1 is a circuit diagram showing a configuration of a grayscale voltage generation circuit according to a first embodiment of the present invention.
【図２】本発明の実施の形態１にかかわる階調電圧生成
回路の階調特性を示す図である。FIG. 2 is a diagram illustrating a gray scale characteristic of the gray scale voltage generation circuit according to the first embodiment of the present invention;
【図３】本発明の実施の形態２にかかわる階調電圧生成
回路の構成を示す回路図である。FIG. 3 is a circuit diagram illustrating a configuration of a grayscale voltage generation circuit according to a second embodiment of the present invention;
【図４】本発明の実施の形態２にかかわる階調電圧生成
回路の階調特性を示す図である。FIG. 4 is a diagram illustrating a gray scale characteristic of a gray scale voltage generation circuit according to a second embodiment of the present invention;
【図５】本発明の実施の形態３にかかわる階調電圧生成
回路の構成を示す回路図である。FIG. 5 is a circuit diagram showing a configuration of a grayscale voltage generation circuit according to a third embodiment of the present invention.
【図６】本発明の実施の形態４にかかわる階調電圧生成
回路の構成を示す回路図である。FIG. 6 is a circuit diagram showing a configuration of a grayscale voltage generation circuit according to a fourth embodiment of the present invention.
【図７】本発明の実施の形態５にかかわる階調電圧生成
回路の構成を示す回路図である。FIG. 7 is a circuit diagram showing a configuration of a grayscale voltage generation circuit according to a fifth embodiment of the present invention.
【図８】従来の階調電圧生成回路の構成例を示す回路図
である。FIG. 8 is a circuit diagram showing a configuration example of a conventional gradation voltage generation circuit.
【図９】従来の階調電圧生成回路の他の構成例を示す回
路図である。FIG. 9 is a circuit diagram illustrating another configuration example of a conventional grayscale voltage generation circuit.
１ 基準電圧生成回路 ２ 階調特性可変回路 ３、３ａ、３ｂ、３ｃ、３ｄ 可変電圧生成回路 ４、５、６、７ 差動増幅器 １１ 階調電圧生成回路 １２ ドライバＩＣ １３ 階調特性可変回路 REFERENCE SIGNS LIST 1 reference voltage generation circuit 2 gradation characteristic variable circuit 3, 3 a, 3 b, 3 c, 3 d variable voltage generation circuit 4, 5, 6, 7 differential amplifier 11 gradation voltage generation circuit 12 driver IC 13 gradation characteristic variable circuit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 池本 哲也 熊本県菊池郡西合志町御代志997番地 株 式会社アドバンスト・ディスプレイ内 (72)発明者 中西 邦文 熊本県菊池郡西合志町御代志997番地 株 式会社アドバンスト・ディスプレイ内 (72)発明者 権藤 賢二 熊本県菊池郡西合志町御代志997番地 株 式会社アドバンスト・ディスプレイ内 Ｆターム(参考） 2H093 NA16 NA53 NC03 ND06 ND35 ND53 ND60 5C006 AA16 AF51 AF52 BB11 BF14 BF24 BF25 BF43 EB05 FA56 5C080 AA10 BB05 DD04 DD25 EE29 FF03 JJ03 JJ05 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsuya Ikemoto 997 Miyoshi, Nishigoshi-cho, Kikuchi-gun, Kumamoto Prefecture Inside Advanced Display Co., Ltd.・ In the display (72) Inventor Kenji Gondo 997 Miyoshi, Nishigoshi-cho, Kikuchi-gun, Kumamoto Prefecture F-Term (in reference) 2H093 NA16 NA53 NC03 ND06 ND35 ND53 ND60 5C006 AA16 AF51 AF52 BB11 BF14 BF24 BF25 BF43 EB05 FA56 5C080 AA10 BB05 DD04 DD25 EE29 FF03 JJ03 JJ05
Claims (4)
成する階調電圧生成回路を備えた液晶表示装置であっ
て、正負の基準電圧から正負対称な複数の参照電圧を生
成する電圧分割回路と、前記電圧分割回路の特定の中間
調に対応する正負対称な１対の電圧分割点に、階調調整
用の正負対称な参照電圧を供給する可変電圧生成回路お
よび１対の増幅器とを備えた液晶表示装置。1. A liquid crystal display device comprising a gradation voltage generation circuit for generating a plurality of reference voltages required for multi-stage display, comprising: a voltage divider for generating a plurality of positive and negative symmetric reference voltages from positive and negative reference voltages. A circuit, a variable voltage generating circuit for supplying a positive / negative symmetric reference voltage for gradation adjustment to a pair of positive / negative symmetric voltage division points corresponding to a specific halftone of the voltage dividing circuit, and a pair of amplifiers. Liquid crystal display device equipped.
成する階調電圧生成回路を備えた液晶表示装置であっ
て、正負の基準電圧から正負対称な複数の参照電圧を生
成する電圧分割回路と、前記電圧分割回路の特定の複数
の中間調に対応する正負対称な前記複数対の電圧分割点
に、階調調整用の正負対称な参照電圧を供給する前記複
数個の可変電圧生成回路および前記複数対の差動増幅器
とを備えた液晶表示装置。2. A liquid crystal display device comprising a gradation voltage generation circuit for generating a plurality of reference voltages required for multi-gradation display, wherein the voltage is for generating a plurality of positive and negative symmetric reference voltages from a positive and negative reference voltage. A voltage dividing circuit that supplies a positive / negative symmetric reference voltage for gradation adjustment to the plurality of positive / negative symmetric voltage dividing points corresponding to a plurality of specific halftones of the voltage dividing circuit; A liquid crystal display device comprising: a circuit; and the plurality of pairs of differential amplifiers.
成する階調電圧生成回路を備えた液晶表示装置であっ
て、正負の基準電圧から正負対称な複数の参照電圧を生
成する電圧分割回路と、前記電圧分割回路の特定の複数
の中間調に対応する正負対称な前記複数対の電圧分割点
に、階調、調整用の正負対称な前記複数対の参照電圧を
供給する１個の可変電圧生成回路および前記複数対の増
幅器とを備えた液晶表示装置。3. A liquid crystal display device provided with a gradation voltage generation circuit for generating a plurality of reference voltages required for multi-gradation display, wherein a voltage for generating a plurality of positive and negative symmetric reference voltages from a positive and negative reference voltage is provided. A division circuit for supplying the plurality of symmetric reference voltages for gradation and adjustment to the plurality of symmetric voltage division points corresponding to a plurality of specific halftones of the voltage division circuit; A liquid crystal display device comprising:
成する階調電圧生成回路を備えた液晶表示装置であっ
て、正負の基準電圧から複数の参照電圧を生成する電圧
分割回路と、前記電圧分割回路の特定の複数の中間調に
対応する正負対称な前記複数対の電圧分割点に、階調調
整用の参照電圧を供給する前記電圧分割点の数と同数の
可変電圧生成回路および増幅器の組とを備えた液晶表示
装置。4. A liquid crystal display device comprising a gradation voltage generation circuit for generating a plurality of reference voltages necessary for multi-gradation display, comprising: a voltage division circuit for generating a plurality of reference voltages from positive and negative reference voltages; The same number of variable voltage generation circuits as the number of the voltage division points for supplying a reference voltage for gradation adjustment to the plurality of pairs of voltage division points having positive and negative symmetry corresponding to a plurality of specific halftones of the voltage division circuit. And a set of amplifiers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11194443A JP2001022325A (en) | 1999-07-08 | 1999-07-08 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11194443A JP2001022325A (en) | 1999-07-08 | 1999-07-08 | Liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001022325A true JP2001022325A (en) | 2001-01-26 |
Family
ID=16324675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11194443A Pending JP2001022325A (en) | 1999-07-08 | 1999-07-08 | Liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001022325A (en) |
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